Dental engine



H. E. WEBER DENTAL ENGINE May 21, 1929.

Filed Dec. 2. 1926 3 Sheets-Sheet.

H. E. WEBER DENTAL ENGINE May 21, 1929 Filed Dec. 2, 1926 3 Sheets-Sheet 3 Patented May 21, 1929.

UNITED STATES. PAT

nanny E. WEBER, or CANTOKOHIO.

DENTAL ENGINE.

Application filed December 2, 1926. Serial No. 152,114.

This invention relates todental engines and more particularly to the mounting of the motor; and the objects of the invention areto provide a motor mounted by means of a.

frictional ivotal connection upon an arm detachable t omthe standard and shaped to form a handle for removing or replacing the motor; to so position the motor that when in use it will rotate upon a substantially horizontal'axis; to pivot the motor at one side of the center to counterbalance the weight of the cord arm when not in use to provide for a detachable electrical connection between the standard and motor .arm which permits of turning movement of the same in a radius of substantially 180 degrees without the use of conductor rings or the like; and to generally improve and simplify the construction of dental engines, H r v An embodiment of the invention is illustrated in the accompanying drawings, in

which Figure 1 is a side elevation of the complete dental engine; 1

Fig. 2, a vertical longitudinal section through the motor arm; v v

Fig. 3,.a section on the line 33, Fig. 2; Fig. 4, a detached elevation of the motor arm; d

Fig. 5, a detail perspective view of the ro-. tatable journal member and socket portion of the electrical connector, and. I

Fig. 6, a detached perspective view of the connector plug carried by the motor arm.

Similar numerals refer to similar parts throughout the drawings.

The device may comprise a pedestal 1 mounted upon a base 2 and supporting a complete dental unit including the arm 3' upon which is swivelled the table arm 4 carrying a table 5, cotton receptacle 6 and a heater 7 upon which. may be supported the usual syringes and sprayers and the like a's-shown. The jointed light arm,8 may be carried, above the table arm 4, and provided with the usual light 9. The bowl arm 10 issupported above the arm 3 and provided with the usual bowl 11, tumbler shield 12 :andspigot 13.

r The invention pertains to the dental engine or motor and the mannerof supporting the same upon theru nit. The light arm 8 may beprovided with a T-head 14 upon which the upright engine support arm 15 is swivelled. In order to provide for detachable connection of this .engine support arm, and to permit the same to be rotatablymounted, and at r the same time to provide for electrically con-.

necting the engine or motor with a source of electric supply extended into the base, a

detachable, swivelled electrical connection is prov ded between the T -head of thev light arm and the engine support arm 15.,

This electrical connection includes the tubular ournal coupling member 16 havingthe reduced shouldered journal portion 17 rotatably journaled axiallywithin the upperend portion of the hollow Thread 14.

Th sreduced portion of the journal memher is provided with an annular groove 18 which may extend substantially half-way around the same and which receives the reduced end of the screw 19, thus limiting the turning movement of the journal memberto substantially 180 degrees.

The upper end of the journal member 16is 7 arranged to have a sliding fit within the low er open end of the engine support arm'15 and is provided with the radial stud 2O arranged to be received in the longitudinal notch 21, formed in the lower portion of the engine support arm. 'A set screw 22 may be provided in the lower portion of the support arm fortemporarily'holding the same against {)vithdrawal from the tubular'journal memer. An electrical receptacle or socket member 23 is fixed in the upper end portion of the journal member 16, being held against move ment. therein as by theset screw 24.] The wires 25 are connected tothe contact. sockets 26 and extending downward through the arm 3v and pedestal 1 where they communicate with a suitable source ofelectric supply: Sufficient slack will be providedv in the wires 25 to permit a turning movement ofsubstantially' .180 degrees, of the journal member 16. Wires 27 and 28 may be connect ed to the wires :25 and lead to the heater 7 and light 9 respectively, and a switch 29 may be provided in the pedestal ,for controlling the entire circuit. ..z

p The connector plug 30 is mounted in a reduced shouldered passage 31, in the engine support .arm, in suchposition'that the contact points 32 thereof will be received in the sockets 26 when the support arm is positioned upon the journal member 16,, as shown in Fig. 2. A set screw 33 may be provided for'holding' the connector plug .30 against movement within the support arm 15 so that the connector plug becomes a permanent part of the support arm. Y

The upper end of the arm is provided with the integral cup shape portion 3st provided with the reduced peripheral flange upon which is journaled the peripheral por tion of a similar cup 36 formed integral with the motor supporting bracket 37.

The cups 3a and 36 are connected together by means of a hollowcylinder 38 having its central portion cut away upon one side as shown at 39. This cylinder is provided at one end with an axial boss 40, received in a central opening 11, in the cup 34, ascrew 422 being threaded into the central threaded bore,

41-3, of the stud, the enlarged head of the screw being received in the shouldered recess 4% in the cup. I p

An axial threaded stud i5 is formed upon the other end of the cylinder 38 and extends through the central opening 16, in the cup 36.

A recess 47 is formed in'the outer. side of the cup to receive the friction washers 48, which are retained in position, between the inner washer 19 and the outer, heavy washer 50, by means of the nut 51 mounted upon the threaded stud 45.

By means of this nut any desired tension may be placed upon the friction washers l8.

The end portion of the end stud 15 is preferably squared and the opening 52 in the washer 50 is of a similar shape. v

The cups 34 and 36 are provided with cooperating shoulders53 for limiting the turning movement of the cup 36 in both directions.

The dental engine or motor 54: is located entirely about the support arm 15, and is mounted upon the bracket 37, being connected thereto as by suitable screws 55 located through the openings 56 in the bracket. As shown in Fig. 1, the center of the motor is at one side of the pivotal center of the bracket for'the purpose of counterbalancing the weight of the cord arm 60 when the motor is in the inoperative position, as shown in this figure.

Sufficient tension is placed upon the triotion washers 48, by means of the nut 51,.to frictionally hold the motor in any position to which it is moved. Thus when it is desired to use the drill or other tool carried by the cord arm, the axis of rotation of the motor is tilted into substantially horizontal position and frictionally held in this position during theoperation. This is a desirable feature as it is found that the motor will operate more easily when the shaft is in substantially horizontal position. 7

lVhen, for any reason, it is necessary to remove the engine or motor the set screw 22 may be loosened and the motor and motor support arm may be entirely disconnected from the dental unit, the connector plug 30 remaining in the motorsupport arm and being disconnected from the socket member 23 as the motor support arm is withdrawn from the tubular journal 16. The support arm 15 forms a suitable handle for removing the motor and carrying the same when detached.

In operating the device it will be seen that the motor arm 15 may be rotated substantially in a half-circle, the journal member 16 rotating within the T-head 14 and being limited in its movement by means of the set screw 19 and annular groove 18. Since sufficient slack is provided in the wires 25 to permit of this turning movement of the motor support arm, it will be seen that the electrical connection to the motor is not interfered with, regardless of the position to which the motor support arm is moved, while the usual conductor rings, which are used in oints of this kind, are not necessary.

The wires 57 lead from the connector plug 30 upward through the hollow motor support arm 15, through the open side 39 of the hollow cylinder 38, through slots" 58 in the cups 34: and 36 and then through an opening 59 in the motor bracket, being" connected to the motor in any usual and well knownmanner.

Since there is no relative movement between the connector plug 30 and the motor, these wires will always remain in the same relative position'and any turning of the motor arm will not affect the same, while sutficient slack is provided in these wires, within the hollow cylinder 38, to permit of the motor being tilted to either extreme.

I claim: 1 g

l. A dental unit including atubular support, a tubular coupling member journaled axially of the tubular support, a tubular motor support arm detachably connected to the coupling member, a motor carried by the support arm, conductors leading from the motor through the arm, tubular; coupling member, and tubular support, and co0perating separable electric connectors in the circuit of said conductors and carried by the tubular coupling and motor support arm.

2. A dental unit including atubular sup port, a tubular coupling member journaled axially of the tubular support, a tubular motor support arm connected to the coupling member, a motor carried by the support arm, conductors leading'from the motor through thearm, tubular coupling member, and tubular support, cooperating separable electric connectors in the circuit of said conductors and carried by the tubular coupling and motor support arm, and means for limiting the movement of the tubular coupling member. i

3. A dental unit including a tubular support, a tubular coupling member journaled axially of the tubular support, a tubular motor supportarm detachably connected to the coupling member, a motor carried by the support arm, an electric connector having contact points carried by the motor support arm, an electric connector having contact sockets carried b the coupling member, conductors leading rom the motor through the support arm to the point connector, conductors leading from the socket connector through the coupling member and tubular support, and means insuring connection of the point conductor with the socket conductor when the motor support arm is connected to the coupling member. s

4. A dental unit including a tubular support, a tubular coupling member journaled' axially of the tubular support, a tubular motor support arm detachably connected to the coupling member, a motor pivotally mounted upon the support arm, conductors leading from the motor through the arm, tubular coupling member, and tubular support, and cooperating separable electric connectors in the circuit of said conductors and port, a tubular coupling member journaled axially of the tubular support, a tubular motor support arm detachably connected to the coupling member, a motor pivotally mounted on the support arm, means for holdc ing said motor in any desired pivotal position, conductors leading from the motor through the arm, tubular coupling member, and tubular support, and cooperating separable electric connectors in the circuit of said conductors and carried by the tubular coupling and motor support arm. p

;In testimony'that I claim the above, I have hereunto subscribed my name.

HENRY E. WEBER. 

